radare2 @5.1.1: ld: Assertion failed

[ryandesign (Ryan Carsten Schmidt)]

radare2 does not build:

​https://build.macports.org/builders/ports-11_x86_64-builder/builds/25301/steps/install-port/logs/stdio

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
/bin/sh: line 0: test: -gt: unary operator expected

ld: warning: -arch not specified
ld: warning: ignoring file tree-sitter/libtree-sitter.a, building for macOS-unknown but attempting to link with file built for macOS-x86_64
0  0x1029a5008  __assert_rtn + 123
1  0x1029af317  ld::passes::objc::getFollowOnAtom(ld::Atom const*) (.cold.1) + 0
2  0x10297369e  void ld::passes::objc::doPass<x86_64, true>(Options const&, ld::Internal&) + 0
3  0x102864487  main + 408
4  0x7fff20343621  start + 1
A linker snapshot was created at:
	/tmp/libtree-sitter.a.a.o-2021-03-01-222501.ld-snapshot
ld: Assertion failed: (0 && "unknown objc arch"), function doPass, file /Library/Caches/com.apple.xbs/Sources/ld64/ld64-609.8/src/ld/passes/objc.cpp, line 2267.